Star formation

The Life of a Star

What is a Star?• A star is a huge sphere of very

hot glowing gas. •When stars are grouped together

we call them constellations. • The big dipper is constellation

that we see often. http://en.wikipedia.org/wiki/File:Big_dipper_from_the_kalalau_lookout_at_the_kokee_state_park_in_hawaii.jpg

The Sun• The Sun is the only star in our solar system• All eight planets, comets, and an asteroid

belt, revolve around the Sun.• The Sun is a yellow, medium sized star.

http://en.wikipedia.org/wiki/File:Yohkohimage.gif

Classifying Stars •Stars are classified according to their temperature and brightness.•Hot Stars are Blue or White•Cooler Stars are Red or Orange

Classifying Stars Cont…•A young star is called a dwarf star• They can be colored red, yellow, or

white.

• Our Sun is a yellow dwarf

•Older Stars are called Supergiants• They can be colored red or blue.

The Timeline of a Star• Our Sun is an average star. The chart below shows the lifecycle

of our sun over billions of years.

http://en.wikipedia.org/wiki/File:Solar_Life_Cycle.svg

How Stars Are Born• Star are formed from giant clouds of dust and gas.• Then, from gravity, the cloud collapses into a rotating gaseous ball.• Once the new star gets hot enough it will begin to create energy from a

process called nuclear fission.• This created energy allows the star to glow for billions of years.

Where Stars are Born• The

EagleNebula

http://en.wikipedia.org/wiki/File:Eagle_nebula_pillars.jpg

The Death of Stars•A Star dies when it runs out of gases to burn.•The Star will first expand into a red, super giant.

http://en.wikipedia.org/wiki/File:Betelgeuse_star_%28Hubble%29.jpg

The Death of Stars Cont…•Then the Star will collapse and explode.• This takes billions of years.

•The size of the star determines how long it’s life is.• The bigger the star the shorter the life.

After a Star Explodes…• The Crab

Nebula

http://en.wikipedia.org/wiki/File:Crab_Nebula.jpg

References• Picture References

• Text References

http://en.wikipedia.org/wiki/File:The_life_of_Sun-like_stars.jpg

"Ask an Astronomer for kids!." Ask an Astronomer for kids!. Web. 25 Feb 2010. . <http://coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/star.shtml>.

http://en.wikipedia.org/wiki/File:Big_dipper_from_the_kalalau_lookout_at_the_kokee_state_park_in_hawaii.jpg

http://en.wikipedia.org/wiki/File:Yohkohimage.gif

"Star Types." Zoom Astronomy. 2010. Enchanted Learning, Web. 1 Mar 2010. <http://www.enchantedlearning.com/subjects/astronomy/stars/startypes.shtml>.

http://en.wikipedia.org/wiki/File:Solar_Life_Cycle.svg

http://en.wikipedia.org/wiki/File:Eagle_nebula_pillars.jpghttp://en.wikipedia.org/wiki/File:Crab_Nebula.jpghttp://en.wikipedia.org/wiki/File:Betelgeuse_star_%28Hubble%29.jpg